Hi, Thanks for writing in. The medication quadiderm contains betamethasone which is a corticosteroid and gentamycin an antibiotic. This works well for bacterial infections. Since you complain of itching in testis and groin, a fungal infection might also be considered. This usually happens due to round worm infection. It affects areas like groin and testis because of sweat formation. Even if you take bath daily, it can still happen if you do not wipe your genital areas completely dry with towel or wear tight inner clothes. Treatment for fungal infection of groin includes applying ointment containing antifungal medications like miconazole of clotrimazole in cream form. Please wear loose cotton inner clothes. Avoid itching the groin unnecessarily. Trim your pubic hairs and wash your genital organs twice a day with warm water and wipe it dry before applying antifungal ointments. This ointment must be applied regularly for a month for desired effects.